Merge branch 'jk/oidhash'

Code clean-up to remove hardcoded SHA-1 hash from many places.

* jk/oidhash:
  hashmap: convert sha1hash() to oidhash()
  hash.h: move object_id definition from cache.h
  khash: rename oid helper functions
  khash: drop sha1-specific map types
  pack-bitmap: convert khash_sha1 maps into kh_oid_map
  delta-islands: convert island_marks khash to use oids
  khash: rename kh_oid_t to kh_oid_set
  khash: drop broken oid_map typedef
  object: convert create_object() to use object_id
  object: convert internal hash_obj() to object_id
  object: convert lookup_object() to use object_id
  object: convert lookup_unknown_object() to use object_id
  pack-objects: convert locate_object_entry_hash() to object_id
  pack-objects: convert packlist_find() to use object_id
  pack-bitmap-write: convert some helpers to use object_id
  upload-pack: rename a "sha1" variable to "oid"
  describe: fix accidental oid/hash type-punning

diff --cc builtin/pack-objects.c
Simple merge

diff --cc commit-graph.c
Simple merge

diff --cc commit.c
Simple merge

diff --cc delta-islands.c
index b959f6c380a6f42849db570cf0a51fed23f2b2a8,88d102298cec4692af7e01d8f4182595a306451d..09dbd3cf72ba99d0f8ab793298b6b80215d450d3
--- 1/delta-islands.c
--- 2/delta-islands.c
+++ b/delta-islands.c
@@@ -454,9 -454,9 +454,9 @@@ static void deduplicate_islands(struct 
        free(list);
  }
  
 -void load_delta_islands(struct repository *r)
 +void load_delta_islands(struct repository *r, int progress)
  {
-       island_marks = kh_init_sha1();
+       island_marks = kh_init_oid_map();
        remote_islands = kh_init_str();
  
        git_config(island_config_callback, NULL);

diff --cc diffcore-rename.c
Simple merge

diff --cc object.c
Simple merge

diff --cc upload-pack.c
Simple merge